/**
 * Copyright (C) 2025 the original author or authors.
 * See the notice.md file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.beust.jcommander.defaultprovider;

import static org.testng.Assert.*;
import static org.testng.Assert.assertEquals;

import java.util.function.Function;

import org.testng.annotations.Test;

import com.beust.jcommander.IDefaultProvider;

public final class SequenceDefaultProviderTest {

	@Test
	public final void shouldProvideFirstNonNullValue() {
        // given
		final IDefaultProvider defaultProvider = IDefaultProvider.sequenceOf(
            always(null),
            always("one"),
            always("two"));

		// when
        final var defaultValue = defaultProvider.getDefaultValueFor("test");

		// then
		assertEquals(defaultValue, "one");
	}

    	@Test
	public final void shouldProvideNullWhenNoProviderProducesSomeValue() {
        // given
		final IDefaultProvider defaultProvider = IDefaultProvider.sequenceOf(
            always(null),
            always(null),
            always(null));

		// when
        final var defaultValue = defaultProvider.getDefaultValueFor("test");

		// then
		assertEquals(defaultValue, null);
	}

    private static final IDefaultProvider always(final String defaultValue) {
        return new IDefaultProvider() {
            @Override
            public String getDefaultValueFor(final String optionName) {
                return defaultValue;
            }
        };
    }

}
